Product legs are designed to be inserted 30cm into the ground for Classic (C) structures. Classic Extra (CX) and Landscape (L) structures are designed to be inserted 38cm into the ground. Product heights indicated are above ground heights after installation. Alternatively, adding patio feet means the product does not to be inserted into the ground - the ideal option for fixing your structure to concrete or wood. Adding patio feet increases the above ground height of a Classic (C) structure by 30cm, and a Classic Extra (CX) or Landscape (L) structure by 38cm.